Question

Child Health and Development Studies (CHDS) has been collecting data about expectant mothers in Oakland, CA since 1959. One of the measurements taken by CHDS is the age of first time expectant mothers. Suppose that CHDS finds the average age for a first time mother is 26 years old. Suppose also that, in 2015, a random sample of 50 expectant mothers have mean age of 26.5 years old, with a standard deviation of 1.9 years. At the 5% significance level, we conduct a one-sided T-test to see if the mean age in 2015 is significantly greater than 26 years old. Statistical software tells us that the p-value = 0.034.

Which of the following is the most appropriate conclusion?

- There is a 3.4% chance that a random sample of 50 expectant mothers will have a mean age of 26.5 years old or greater if the mean age for a first time mother is 26 years old.
- There is a 3.4% chance that mean age for all expectant mothers is 26 years old in 2015.
- There is a 3.4% chance that mean age for all expectant mothers is 26.5 years old in 2015.
- There is 3.4% chance that the population of expectant mothers will have a mean age of 26.5 years old or greater in 2015 if the mean age for all expectant mothers was 26 years old in 1959.

Answer #1

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester. In a fictitious study,
suppose that CHDS finds the average weight increase in the second
trimester is 14 pounds. Suppose also that, in 2015, a random sample
of 40 expectant mothers have mean weight increase of 16 pounds in
the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester. In a fictitious study,
suppose that CHDS finds the average weight increase in the second
trimester is 14 pounds. Suppose also that, in 2015, a random sample
of 40 expectant mothers have mean weight increase of 16 pounds in
the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester. In a fictitious study,
suppose that CHDS finds the average weight increase in the second
trimester is 14 pounds. Suppose also that, in 2015, a random sample
of 35 expectant mothers have mean weight increase of 16.1 pounds in
the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester.
In a fictitious study, suppose that CHDS finds the average
weight increase in the second trimester is 14 pounds. Suppose also
that, in 2015, a random sample of 42 expectant mothers have mean
weight increase of 15.7 pounds in the second trimester,...

Question 5
Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence to show that this is not
true at her university. A random sample of 31 students were asked
to keep a diary of their activities over a period of several weeks.
It was found that the average number of hours that the 31 students
studied each week was 18.9 hours....

1) The amount of money spent weekly on cleaning, maintenance,
and repairs at a large restaurant was observed over a long period
of time to be approximately normally distributed, with mean
μ = $599 and standard deviation σ = $42.
(a) If $646 is budgeted for next week, what is the probability
that the actual costs will exceed the budgeted amount? (Round your
answer to four decimal places.)
(b) How much should be budgeted for weekly repairs, cleaning, and
maintenance...

MATHEMATICS
1. The measure of location which is the most likely to
be
influenced by extreme values in the data set is the a. range
b.
median c. mode d. mean
2. If two events are independent, then a. they must be
mutually
exclusive b. the sum of their probabilities must be equal to one
c.
their intersection must be zero d. None of these alternatives
is
correct. any value between 0 to 1
3. Two events, A and B,...

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